The screen "unglued" and broke, repaired now it's painfully slow

Hey, I have the very same trouble. Change of hdd to SSD and was working like a charm for 7 months, then the screen "unglued" and broke. I took it to a repair shop and since it's painfully slow. I have to add that when I changed the ssd I used a sensor temperature cable so I didn't had to use any kind of fan controlling app. Since the screen replacement, the shop had to install one to make the fan go quiet. Any ideas of what is going wrong please ?

Here is a screenshot of TG PRO app.

BIG THANKS IN ADVANCE ==